On this day in ...
... 1828, Russia declared war on Turkey, asserting that the latter had breached the 2-year-old Treaty of Akerman. Eventually Turkey's sultan would yield to Russia's tsar. The ensuing 1829 Treaty of Adrianople resulted in entrenching Russia's hold on Caucasus and Danube territories.
... 1248, the Gothic structure in Paris known as La Sainte-Chappelle was consecretated. It was built as the royal chapel for the "ultra-devout" King Louis IX, and its stories-tall stained-glass windows (above) are, even today, a sight to behold.
(Prior April 26 posts are here and here.)